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采用常压固相酸催化热缩合法,以L-天冬氨酸(L-ASP)为原料,85%磷酸为催化剂,采用分批添加等量催化剂的方法,合成了高聚合度的聚琥珀酰亚胺(PSI)。探讨了反应时间、温度、催化剂用量及其加入方式对单体转化率及产物聚合度的影响,采用红外光谱对产物结构进行了表征。当催化剂/单体为0.5(摩尔比),分4次等量加入时,单体转化率为98.42%,PSI的聚合度高达602。采用己二胺对PSI进行交联反应,制备了可生物降解的高吸水性树脂,探讨了PSI聚合度对吸水倍率的影响,结果表明,PSI聚合度越高,树脂的吸水性能越好。
Using the method of atmospheric-pressure solid-phase acid-catalyzed thermal shrinkage, L-aspartic acid (L-ASP) as raw material and 85% phosphoric acid as catalyst, an equal amount of catalyst was added in batches to synthesize poly Imide (PSI). The effects of reaction time, temperature, amount of catalyst and its addition method on the monomer conversion and product polymerization degree were discussed. The product structure was characterized by infrared spectroscopy. When the catalyst / monomer is 0.5 (molar ratio), the monomer conversion is 98.42% and the degree of polymerization of PSI is up to 602 when it is added in 4 equal portions. The cross-linking reaction of PSI with hexamethylene diamine was used to prepare biodegradable superabsorbent resin. The effect of PSI polymerization degree on water absorption ratio was discussed. The results showed that the higher the degree of polymerization of PSI, the better the water absorption of resin.